Fountain Valley, CA Outdoor Lighting: Light Trespass & Shielding (2026)

The City of Fountain Valley addresses light spilling onto neighboring land in its Development Code, Chapter 21.18 (Site Planning and General Development Standards), in the exterior lighting section, § 21.18.060. Subsection (e), headed Mechanical or Chemical Processes, is the boundary rule: light, heat or glare from mechanical or chemical processes, or from reflective materials used or stored on a site, must be shielded or modified to prevent emission of light or glare beyond the property line.

The standard is written as prevention at the boundary, so the test is whether light or glare leaves the parcel, not how bright it is at the source. It reaches operations such as industrial processing, and it also reaches stored reflective materials, which can throw sun glare onto adjoining properties. The remedy is in the operator's hands: shield the source or modify it.

It sits beside subsection (d), which separately requires shielding where a light source is visible from outside the project boundary, so that neither the source nor its reflection is directly visible from any point five feet or more beyond the property line. Subsection (d) carves out single-family residential uses, traffic safety lighting and public street lighting. Subsection (e) contains no such carve-out in its own text.

The Development Code repeats the same concern for temporary events. Section 21.10.050(a)(1)(B) lists regulation of nuisance factors, including prevention of glare or direct illumination on adjoining parcels, among the standards for temporary outdoor displays and sales approved by temporary use permit under Chapter 21.48, limited to three days per event and eighteen days per calendar year.

The City Council adopted § 21.18.060 in 2000 as Ordinance 1308. Zoning-district standards in Chapters 21.04 through 21.14 take precedence over Chapter 21.18 if the two conflict.